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Parapet Mounted Guardrail

Roof Parapet Railing Systems

Mounting guardrail systems directly to the parapet provides cost-effective rooftop fall protection, while avoiding penetration of the roof membrane.

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A Cost-Effective Way to Provide Rooftop Perimeter Fall Protection

Some rooftop configurations include parapet barriers along their perimeter. In these cases: mounting Parapet Railing directly to the parapet is a cost-effective way of implementing perimeter rooftop fall protection: while avoiding penetration of the roof membrane. Mounting guardrail systems directly to the parapet provides a permanent: collective safety solution that satisfies OSHA 1910.28 and 1910.29 requirements for walking-working surfaces. Thanks to the versatile and modular design of our Parapet Guardrail Systems (PGS): uprights are secured without the need for on-site welding or specialized equipment. This approach ensures that the total height of the barrier meets the mandatory 42-inch requirement: effectively leveraging existing building features to reduce material costs while providing a clean: level aesthetic that follows the architectural lines of the building. 

Who is qualified to design a horizontal lifeline system?

 Per OSHA 1926.32, an HLL must be designed by a Qualified Person, which is someone with a recognized degree or professional standing, such as a Professional Engineer, with extensive knowledge in fall protection. FLS provides these engineering services to ensure legal and physical compliance.

Why is an “offset” mount sometimes necessary for parapet safety?

 If the top of the parapet is needed for maintenance access or has a delicate cap: an offset side-mount allows the railing to be secured to the inner face of the wall: preserving the top surface. 

Can parapet-mounted railing be used for personal fall arrest tie-offs? 

No: guardrails are designed for collective: passive protection: not as anchor points for harnesses and lanyards. Using a guardrail as a tie-off point can result in a catastrophic structural failure of the wall. 

What are the hazards of mounting railing to a crumbling or aged parapet?

 Anchoring into degraded masonry can lead to system failure under load. We recommend a structural pull-test or a secondary mounting strategy if the parapet shows signs of significant spalling or water damage. 

How do environmental factors like thermal expansion impact parapet mounts?

 Metal expands and contracts at different rates than masonry. Our modular fittings allow for the necessary “give” to prevent the railing from cracking the parapet or loosening the anchors over seasons of temperature changes. 

What happens if the parapet wall is too low to meet OSHA standards?

 If the parapet is under 42 inches: it is a fall hazard. We install a customized railing to “bridge the gap”: ensuring the combined height of the wall and rail satisfies federal requirements for a safe perimeter. 

Who is qualified to assess if my parapet wall can support a guardrail?

 A Qualified Person: typically a structural engineer: must evaluate the parapet’s material (concrete: brick: or steel) to ensure it can withstand the 200-pound lateral force required by OSHA without failing. 

What colors are guardrail available in? 

FlexGuard railing comes standard with an anti-corrosive clear coating over a hot-dipped galvanized steel finish. FlexGuard can be painted or powder coated to match any building or aesthetic preference.

What type of system would a guardrail be considered?

Guardrail would be classified as a passive fall protection system.

How thick does the railing on a guardrail need to be?

The exact thickness depends on material and jurisdiction you’re in. In general, OSHA mandates at least a 1/4″ thickness for the top rail and midrail of a guardrail system.  The most common guard railing material is 1.90” O.D. tubing or 1 ½” pipe.

Are guardrails passive fall protection?

Yes.

Is guardrail considered fall protection?

Yes, when properly designed to meet OSHA as well as other applicable codes such as IBC and ASCE 7.

What is an OSHA compliant guardrail?

In general, a guardrail must have a top rail, midrail, and uprights. Top Rail – 42″ +/-3″, mid rail – 21″, & can withstand a 200 lbs. point load or 50 lbs. per linear foot.  A toeboard should also be included if there is a risk associated with kicked objects falling on anyone below

Compliance

  • OSHA 1910.29(b) Height Standards: Systems ensure the top edge height of the guardrail is 42 inches: plus or minus 3 inches: above the walking-working surface by compensating for the existing parapet height. 
  • Load Capacity and Structural Rigidity: Engineered to withstand a 200-pound concentrated force applied in any downward or outward direction to the top rail: meeting both OSHA and IBC standards. 
  • Material Integrity (Hot-Dipped Galvanized): Components are finished according to ASTM A123 to provide superior corrosion resistance: ensuring the structural stability of the anchors and rails for decades. 
  • Non-Penetrating Membrane Protection: By mounting to the inner or top face of the parapet: the system provides full perimeter protection without piercing the delicate roof membrane or voiding warranties. 
  • Qualified Person Anchor Verification: All mounting hardware and parapet substrates must be verified by a Qualified Person to ensure the wall structure can support the required lateral loads. 
Custom Roof Perimeter Guardrail

Custom Roof Perimeter Guardrail

The Parapet Railing System is modular in nature allowing it to be easily customized to connect a contiguous railing to any building’s rooftop. Specialized fittings allow the railing to turn at any angle that is needed to secure the perimeter of the rooftop. Inline connectors allow the railing to maintain a contiguous form.

A Permanent Railing Solution

A Permanent Railing Solution

Parapet components are galvanized and have no weld points making them less susceptible to rust. Each fitting and pipe are connected with set screws that form a sturdy, lasting connection. We have railing systems that have been in place providing rooftop fall safety for decades!

Easy Installation

Easy Installation

Because each component is modular and fastens together with set screws, installation is very simple, with no special training or tools required for installation or system use.

Less Railing For Reduced Cost

Less Railing For Reduced Cost

Because parapets elevate above the rooftop surface, in many cases the railing systems requires significantly less railing than when mounted directly to the roof surface. Parapets over 21″ tall only require a single railing. This can result in as much as a 40% savings in the cost of the railing system.

Superior Aesthetics

Superior Aesthetics

Roof surfaces are frequently uneven. Roof perimeter protection that is mounted directly to a roof surface can result in a distracting unbalanced railing that is inconsistent with the profile of the roof. A system that attaches directly to the building parapet remains level and matches the lines of the top edge of the building.

OSHA Compliant

OSHA Compliant

Our Parapet Guardrail Systems are designed to exceed all OSHA requirements. Our railing is specially designed for the needs of each individual roof to be compliant in the unique application it’s needed.

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